Magnetic control for antenne



April 14, 1931. E. H. HAND 1,801,042

MAGNETIC CONTROL FOR ANTENNAE Filed March 10, 1928 llll a INVENTOR BY LQL- 54mm, ORNEY Patented Apr. 14, 1931 r 1281,42

ERLE H. HAND, or new YORK, n. Y.

MAGNETIC CONTROL FOR ANTENNZE Application filed March 10, 1828. Serial No. 260,569.

This invention relates generally to radios Fig. 7 is a perspective detail view of the and has more particular reference to a novel mounting of the arm to the vertical shaft. magnetic control device for directionally The reference numeral 10 indicates generpositioning the antenna thereof, when the anally a casing with a cover 11 and a base 12.

tenna is located at a distance from the point A vertical shaft18 is rotatably mounted in 65 of control or receiving set. the casing and projects from the top thereof.

The invention has for an object the provi- The mounting of this shaft consists of a sion of a device of the class mentioned, which standard 14 provided with a lower thrust is of simple, durable, construction, desirable bearing 15 and an upper bearing 16. A horiand efficient in action and which can be manuzontal partition 17 of insulation material is 60 factured and sold at a reasonable cost. mounted within the casing 10 and supports The device consists of a casing rotatively a plurality of electromagnets 18 arranged in supporting a vertical shaft upon which the clrcular format onrelative to the shaft 13 as antenna is mounted, and a horizontal partia center. A disc 19 formed with notches tion of insulation material is mounted within whichcorrespond with the number of mag- 65 the casing. A plurality of electric magnets nets 18 1s fiXed on the shaft 13 and a solenoid are mounted in the partition in circular 20 1S hed to the cover 11 and its plunger formation. An arm projects from the ver abuts the perlphery of the CllSC 19 and tical shaft into the field of action of the said g g the ZIdJHCBHt IIOtOh- Normally 1n 9 m t O f th d f h f th the absence ofa force to turn the shaft 13,

windings of the electromagnets are connected the disc-19 and R 9 h Solenoid 20 ith a power l d d th th d are hold theshaft against vibrational turning.

connected with contacts arranged on the rear A v antenna 21 IS PPOrted to the top id f a di l t d on th f t panel f of shaft 13 and the elements at the bottom 5 a radio set. A knob is mounted on the front of the Shaft Serve t P p of the Stand of the dial and carries a rear contact arm for the antennaaiwhlch y Test 1113011 a suitengageable with the said contacts, and a able pp second power lead connects this contact arm. The reference numeral ln lcates general- F f th comprehension f the i ly the front panel of a radio set connected with tion, and of the objects and advantages therethe antenna 2415: fixed p h 88 of, reference Will be had to the following de- Pane1 23 a thls 1S l l ted near 1ts scription and accompanying drawings, and P H FY 7 symbols 2 denotlllg t h appended Claims in which the Various various directlons such as north, northeast, novel f t f the invention are more pap etc. A knob 26 1s rotatively mounted in the ficujarlv Set forth center of the dial, and has anindicating fin- 85 Referring to the accompanying drawing, t on lts from: and a Contact n 28 on 1 s rear.

forming a material part of this disclosure 2- Fig. 1 is a perspective view of the device. Fig. 2 is a fragmentary front elevational view of the front panel of a radio set, illus- A plurality of contacts 29 are arranged on the rear side of the dial in circular form..- tion relative to the pivot point of the contact 9 finger 28 as a pivot. The knob 26 maybe tmttng h dull of the f turned to selectively make contact with the 9 3 3* rear thereof contacts 29 in consecutive order. At each l7TOY1ded,W1th l z econtact, the antenna21 turns in the direction g- 4 1S a vertlcfll sect-101131 VleW, taken on indicated at the corresponding contact point 95 the 11119 4- on the dial 24, due to the magnetized electro- Fig. 5 1s a horizontal sectional view, taken magnet 18, When the current passes thru 011 h line 0f gany one of the electromagnets 18, solenoid 20 Fig. 6 is a fragmentary sectional view is also energized, and causes the plunger 20 taken on the line 66 of Fig. 4. to disengage the notch of disc 19 while shaft 106 13 is rotating. When the antenna 21 is in the desired position, the circuit is open and the spring of the solenoid 20 looks shaft 13. A projection 30 from the knob 26 is engageable with the stop lug 31 on the dial so as to prevent continued turning of the knob in one direction. The wires 32 connect the contacts 29 with one of the ends of the windings of the magnets 18, in similar consecutive order. Wires 33 connect the other ends to a power lead 34 and a coacting power lead 35 is connected with the contact finger 28.

A bracket 36 is firmly fixed on shaft 13 and has a side slot 37 in which an arm 38 is slidably mounted. The inner side of the arm threadedly engages a screw 39 rotatively mounted in the bracket, and having a projecting head 40; The outer end of the arm projects into the field of action of the magnets 18. The head 40 may be turned to raise or lower the arm relative to the magnets 18.

In operation, the knob 26 is turned so that the pointer 27 aligns with the north symbol on the dial, and this causes one of the magnets 18 to be energized. The finger 38is then set over the energized magnet, and the antenna 21 ispositioned to face the north.

The operation of the radio set may then move knob 26 clockwise or anticlockwise, so that contact finger -28 consecutively makes contact with the contacts 29, consecutively energizing the magnets 18, and finger 38 follows the path of the energized magnets, correspondingly turning the antennae 21 in desired directions.

It is to be understood that while the antenna shaft has been described to be vertical, it may also be set in a horizontal or 1. In a magnetic control for an antenna, a

casing, a vertical shaft rotatively mounted therein and projecting for supporting anantenna, means for turning the shaft including a plurality of electro-magnets in a circle around said shaft and in a horizontal plane,

a bracket firmly fixed on said shaft and formed with a vertical slot, a screw rotatively mounted in said slot, and an arm threadedly engaging said screw and extending from said slot into the fields of action of said magnets. r I

2. In a magnetic control for an antenna, a casing, a vertical shaft rotativelymounted therein and projecting for supporting an antenna, means for turning the shaft including a plurality of eleotro-magnets in a circle around said shaft and in a horizontal plane, a bracket firmly fixed on said shaft and formed with a vertical slot, a screw rotatively mounted in said slot, and an arm threadnature.

ERLE H. HAND. 

